Telephone or other sound receiver



May 22, 1923. I 1 55 L. STEINBERGER TELEPHONE OR OTHER SOUND RECEIVER Filed Jan 21 1921 IN VEN TOR Patented May 22, I923.

stare TELEPHONE OR OTHER SOUND RECEIVER.

Application filed January 21, 1921. Serial No. 438,852.

To all whom it may concern:

Be it known that I, LoUIs STEINBERGER, a citizen of the United States, and a resident of the borough of Brooklyn, city and State of New York, have invented certain new and useful Improvements in Telephone or Other Sound Receivers, of which the following is a specification.

My invention relates to sound receivers particularly adapted for use in telephone systems or in talking machines whereby the equalization of air pressure may be effected on both sides of the diaphragm.

One of the objects of the invention is to provide a sound receiver so constructed that the diaphragm is held in place by metallic clamping means effective throughout its periphery, said metallic clamping means being also provided for permitting free passage of air from the upper to the lower side of the diaphragm around the edge thereto, thereby equalizing the air pressure thereon and permitting more effective operation of the diaphragm.

Another object of the invention is to provide means for locking the diaphragm between two metallic members when the cap is secured in place to the lower portion of the receiver, thereby increasing the tonal qualities and causing the sound to be more penetrating.

Other objects of the invention will appear from the subjoined specification and claims.

In the drawings:

Fig. 1 is a View partly in section and partly in elevation of a telephone sound receiver embodying my invention.

Fig. 2 is a perspective view of one of the metallic rings, namely that one which is secured to the cap.

Fig. 3 is a perspective view of the form of metallic ring secured to the lower casing of the receiver.

In the drawings, 5 designates the exterior casing of a telephone receiver which consists either of 'electrose or hard rubber or any suitable non-metallic insulating material having an open end across which a vibratory diaphragm 6 extends. During the formation of the lower portion of the receiver when made of moldable insulating material, a metallic ring 10 such as shown in Fig. 3 is placed in the mold and the insulating material molded around the radially extending flange 11 thereof to hold the said ringin place, which flange has a depending portion 11 provided with anchoring means to hold it to the insulating materlal. In the event that the insulatin material of the receiver is not moldable t e ring may be anchored to the open edge of the casing-by any suitable means which is well known. in the art for securing metal bodies to insulatin material n the upright cylindrical portion of the ring 10 I provide a plurality of holes or apertures 15 extending therethrough to operate as air passages for the purpose hereinafter described.

In constructing the cap 7 in the form as shown in Fig. l, or in any suitable form when the insulating material used is moldable, I mold therein a metallic ring 20, such as shown in Fig. 2, which has preferably two rows of perforations 21 and 22, the row of perforations at 21 being used as an anchoring means for the insulating material which will enter and pass through the same durin the act of molding the cap into shape, and {BT16 other perforations as at 22 are utilized as air and sound passages for the purpose hereinafter described.

The diaphragm is held in place by the cap 7 preferably made of material similar to that of which the casing is made, and having threaded connection therewith at 8 apart from the diaphragm whereby a chamber 9 is provided between the cap and the diaphragm leading to the atmosphere through an o ening 0, and a chamber 19 is also provi ed on the under side of the diaphragm, as clearly shown in the drawing. The cap is formed as described above so that there are two flanges projecting downwardly from the underside thereof, namely, the metallic flange 20 and the integral insulating flange 12. Each of these flanges are situated apart from each other so as to form when the cap is in place a chamber 25, which when the cap is mounted upon and secured to the lower portion of the sound receiver, extends from a point above the diaphragm to a point below the same and surrounds the edge thereof. The lower portion of the flange 12 is screw-threaded on the interior surface so as to engage with the outer surface of the casing of the receiver at 8, thus efi'ecting an-engagement therewith to hold the cap and diaphragm in place. The lower portion of the exterior of the receiver casing 5 has projecting upwardly therefrom, as above described, a metallic flange 10 upon which the diaphragm 6 rests and against which the diaphragm is clamped b the underside of the metallic flange 20 secured to the cap, when the cap is screwed into place. It will thus be seen that the diaphragm is rigidly and permanently held in place around its periphery by being clamped between the two metallic flanges 20 of the cap and 10 of the lower portion of the receiver so that the pressure is uniform and there will be no danger of the diaphragm buckling in any way.

The locking of the diaphragm between the two metallic members also causes an increase of tonal. quality that makes the sound more penetrating.

Air and sound communication between the chamber 9 and chamber 25 is effected by means of a purality of conduits 22 extending through the metallic ring 20 forming the upper clamping flange, and likewise communication between the chamber 19 and the chamber 25 is eflecte'd by a plurality of conduits 15 extending through the metal ring 10. This arrangement of air conduits is efiective to provide air communication from the chamber 9 through the chamber 25-to the chamber 19, and consequently provides for an equalization of air pressure on both I sides of the diaphragm The magnet elements, in the interest of clearness, are not shown, and it is deemed s'ufiicient only to Say that they may be of any suitable form as my invention is in no way concerned with the details of the magnets whereby the diaphragm is caused to vibrate.

The construction above described is simple and efiective for providing a uniform metallic clamping means for the diaphragm and for also providing equal air pressure on both sides of the diaphragm and thereby causing the diaphragm to be more sensible to the sound vibrations and to permit more efiective operation thereof, in that the sound waves are amplified to insure greater clearness, distinctness and purity of tone, the tone becoming vibrant, penetrating and more musical.

As changes of construction could be made within the scope of my invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. A sound receiver comprising a casing having a perforated annular metallic ring secured thereto, a cap engaging said casing, said cap having a perforated metallic ring secured thereto and a diaphragm held in place between said rings, said perforations leading into an annular chamber formed between the cap and metallic rings.

2. A sound receiver comprising a casing having an annular metallic ring molded thereto, said casing having an outer threaded portion surrounding said ring, a cap having a threaded flange engaging said casing, an inner metallic ring space away from said flange to form an annular chamber and sound receiver comprising a casing end thereof, a metallic ring of angular cross section molded in said casing, a hollow cap having a threaded flange engaging said casing, a metallic ring spaced away from said flange to form an annular chamber, and a diaphragm whose outer edge is clamped between said metallic rings.

5. A sound receiver comprising a hollow casing having screw threads formed on one end thereof, a metallic ring of angular cross section molded in said casing, a hollow cap having a threaded flange engaging said casing, a metallic ring spaced away from said flange to form an annular chamber,and a dipahragm whose outer edge is clamped between said metallic rings, each of said rings having perforations therein which communicate with said chamber to equalize the pressure acting on both sides of said diaphragm.

In witness whereof, I have hereunto set Louis STEINBERGER. 4

myhand at the borough of Manhattan, city 

